MAF sensor electrical from fuse box

[Charlie Vortec]

Hello, I have a 96 K2500 with the 5.7 Vortec. It's running rough and idles up and down on start and hiccups on the highway; engine code P0102. I cleaned the MAF but no change. The engine does better if the MAF is disconnected, and my mileage takes a nosedive. I checked the electrical feed and ground is good, the sensor power is good at 5V, however the wire for the constant 12V is dead.

I tried tracing the wire, but it goes into a wire bundle then to the ECM or fuse box. I'm thinking next steps are to test the wire end to end continuity and check if the ECM or fusebox is putting out 12V. Does anyone
know or have an electrical diagram to point me to the wire connectivity on the ECM or fusebox side of the electrical?

I'm a DIY and I'm learning so any and all help is appreciated.

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[Charlie Vortec]

Mine is doing the same thing. I just haven't had time to troubleshoot it yet